Method for producing samarium-cobalt series sintered materials

A sintered material, samarium cobalt technology, applied in the direction of magnetic materials, electrical components, circuits, etc., can solve the problems of high technical difficulty, decreased magnet performance, poor performance of samarium cobalt magnetic powder, etc., to achieve simple and convenient preparation process, optimize microstructure, Guaranteed magnetic properties

Active Publication Date: 2014-01-01
NINGBO STAR MATERIALS HI TECH
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Problems solved by technology

[0005] Chinese patent CN10175511 discloses a method for smelting sintered samarium-cobalt permanent magnet material master alloy. Based on the characteristics of samarium being easy to oxidize and high temperature, it is proposed to add samarium after the smelting process, and then pour the smelted alloy in a constantly rotating On water-cooled rollers or discs, alloy cast sheets with a single phase composition of columnar crystal structure are obtained, but when samarium-cobalt magnets are used at high temperatures, the problem of samarium oxidation will also occur, resulting in a decline in the performance of the magnets; Chinese patent application CN101364465 discloses A rare-earth permanent magnet material and its preparation method, which proposes doping nanocrystalline oxide, using nanocrystalline oxide as the pinning phase of crystal grains, to prepare a composite nano-oxidant-enhanced sintered NdPr permanent magnet, but the nanocrystalline oxide The pinning effect of the invention is used in conjunction with the formula proposed by the invention, mainly to fix the neodymium-rich phase of the grain boundary, thereby ensuring the high temperature performance of the magnet
In order to reduce costs, researchers have also developed a calcareous reduction diffusion method to prepare samarium-cobalt magnets. However, using this method, the content of samarium and cobalt (the error is not greater than ±0.5%) is not easy to control accurately, and the composition is prone to segregation. Water washing method to remove calcium It also leads to high impurity content and oxygen content, so the performance of the prepared samarium cobalt magnetic powder is poor
In addition, in the field of NdFeB magnetic powder research, it is reported that: through the combination of purification technology with trace calcium alloy removal and microporous foam ceramic filtration, thin plate ingot technology to reduce component segregation, improved induction or electric gravity The system integration of advanced technologies such as melting quick quenching technology and dynamic crystallization treatment can prepare nanocrystalline quick quenched NdFeB magnetic powder. The magnetic properties of the magnetic powder are equivalent to those of similar products of the American MQ company, but this method is also used in conjunction with the formula proposed by the invention. It is mainly the neodymium-rich phase that fixes the grain boundaries, and it also needs to remove impurities and filter calcium, which is technically difficult

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  • Method for producing samarium-cobalt series sintered materials
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  • Method for producing samarium-cobalt series sintered materials

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Embodiment 1

[0032] Raw materials were weighed according to the following weight fractions: samarium: 16.9%; cobalt: 49%; iron: 15.5%; copper: 6.3%; zirconium: 2.6%; dysprosium: 1.6%; 0.1%.

[0033] 1) Alloy smelting: Co and alloy elements are mixed according to the ratio, placed in a water-cooled copper crucible in an electric arc furnace, Sm and metal calcium are mixed in a feeder, and vacuumed to 10 -3 Pa or above, then pass high-purity argon gas at 0.1 atmospheric pressure, working voltage 30V, working current 630A, melt under the protection of argon, but all the materials in the crucible are melted, add the mixture of samarium and calcium, and repeatedly melt 4 times To obtain alloy liquid with uniform composition;

[0034] 2) Rapid quenching: casting the uniformly smelted alloy liquid onto a rotating water-cooled copper roll, water-cooled molybdenum roll, copper plate or molybdenum plate at a speed of 0.6m / s to prepare an alloy cast strip;

[0035] 3) Magnetic powder preparation: c...

Embodiment 2

[0043] Raw materials were weighed according to the following weight fractions: samarium: 20.78%; cobalt: 51.81%; iron: 12.93%; copper: 6.34%; zirconium: 1.71%; dysprosium: 5.43%, magnesium: 1%.

[0044] 1) Alloy smelting: Co and alloy elements are mixed according to the ratio, placed in a water-cooled copper crucible in an electric arc furnace, Sm and metal magnesium are mixed in a feeder, and vacuumed to 10 -3 Pa, then feed high-purity argon gas at 1.2 atmospheric pressure, working voltage 45V, working current 750A, smelting under the protection of argon, but all the materials in the crucible are melted, add the mixture of samarium and magnesium, and repeatedly smelt 3 times to get Alloy liquid with uniform composition;

[0045] 2) Rapid quenching: casting the uniformly smelted alloy liquid onto a rotating water-cooled copper roll, water-cooled molybdenum roll, copper plate or molybdenum plate at a speed of 0.6m / s to prepare an alloy cast strip;

[0046] 3) Magnetic powder p...

Embodiment 3

[0054] Weigh raw materials according to the following weight fractions: samarium: 16.9%; cobalt: 49%; iron: 15.5%; copper: 6.3%; zirconium: 2.6%; dysprosium: 1.6%; : 0.05% (the dosage of calcium hydride is calculated based on the calcium content).

[0055] 1) Alloy smelting: Mix Co and alloy elements according to the ratio, place in a water-cooled copper crucible in an electric arc furnace, place a mixture of Sm and calcium hydride in a feeder, and evacuate to 10 -3 Pa, then feed high-purity argon gas at 1.0 atmospheric pressure, working voltage 45V, working current 650A, melt under the protection of argon, but all the materials in the crucible are melted, add the mixture of samarium and calcium hydride, and repeatedly smelt for more than 4 times Obtain alloy liquid with uniform composition;

[0056] 2) Rapid quenching: casting the uniformly smelted alloy liquid onto a rotating water-cooled copper roll, water-cooled molybdenum roll, copper disc or molybdenum disc at a speed o...

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Abstract

The invention relates to a method for producing samarium-cobalt series sintered materials, which comprises alloy smelting, rapid quenching to produce alloy cast strips, magnetic powder production through combining a hydrogenation and disproportionation method and an air-stream milling method, orientation and forming, positive pressure sintering, solid solutioning and aging. The method introduces a magnesium oxide or calcium oxide pinning phase through innovating the melting and powder processing technology, the microstructure of a magnet is optimized to the maximum extent, the magnet can mainly consist of columnar crystal, a crystal boundary comprises the magnesium oxide or calcium oxide pinning phase, so the orientation is easy, and the high-temperature property of the magnet is stable; and moreover, the magnesium oxide or calcium oxide is not needed to be cleaned and removed after the smelting is completed, and the production technology is simple and convenient.

Description

technical field [0001] The invention relates to a rare earth permanent magnet material, in particular to a preparation method of a samarium cobalt series sintered material. Background technique [0002] In recent years, the continuous development of functional materials has effectively promoted the social progress of human society. Permanent magnetic materials are one of the functional materials. Due to their energy conversion function and various magnetic physical effects, they have been widely used in today's information society. . Rare earth permanent magnet material is the permanent magnet material with the highest comprehensive performance known at present. Its magnetic performance is more than 100 times higher than that of magnet steel, and its performance is much superior to that of ferrite and alnico. Since the use of rare earth permanent magnet materials not only promotes the miniaturization of permanent magnet devices and improves the performance of products, but ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/02B22F3/16B22F1/00B22F9/04B22F3/24B22D11/06H01F1/053
Inventor 潘道良苏广春关井和
Owner NINGBO STAR MATERIALS HI TECH
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